Dishwashing machine



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DISHWASHING MACHINE Filed May 2, 1950 5 Shets-Sheet 4 I I lnUeTElE-r": 1 Edgar 5. -575oddard Feb. 6, 1934. E. s. STODDARD DISHWASHING MACHINE Filed May 2, 1930 5 Sheets-Sheet 5 8 llllllllllllllllllll 0.

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Patented Feb. 6, 1934 UNITED STATES DISHWASHING MACHINE Edgar S. Stoddard, Berwyn, 11]., assignor to The Conover Company, Chicago, 111., a corporation of Illinois 'Application May 2, 1930. Serial No. 449,184

3 Claims.

This invention relates to improvements in washing machines, and particularly in dishwashing machines of the non-portable type.

An object of this invention is to provide a builtin dishwashing machine which is of large capacity and which is very economical as regards space consumption.

Another object of the invention is to provide a built-in dishwashing machine which is adapted to cooperate in construction and harmonize in design with the household kitchen equipment now in current use.

A further object of this invention is to provide a washing machine to which may be added wash and rinse liquids and from which waste liquids may be removed in a very convenient manner without removal of the cover and without stopping the machine.

7 Other objects will appear during the course of the following specification, among the more important ones of which are to provide a positive and direct action discharge for a non-portable dishwashingmachine, an improved side opening cover, a manually controlled discharge mechanism which is adapted either to maintain a fixed quantity of water in the lowei part of the machine or to cause discharge of all liquid from the washing chamber of the machine, and an improved manner of supporting the tank of the ma- 30 chine from the floor.

Although this invention is broadly directed to improvements in connection with all washing machines, it is especially directed to the adaptation of centrifugal spray-projector types of 'dlshwashing machines to built-in constructions. Spray-projector types of dishwashing machines of the portable type are shown in the Patent No. 1,679,465 dated August 7, 1928, and the copending applications Serial Nos. 193,414; 262,652; 344,112 and 389,696 filed May 23, 1927, March 19, 1928, March 5, 1929 and August 31, 1929, respectively.

The following drawings illustrate one embodiment of the invention as applied to the centrifugal spray-projector type of dishwashing machines, to which the invention is by no means restricted.

Fig. 1 represents a vertical sectional view of the combined sink and dishwasher upon the line 1-1 of Fig. 4;

Fig. 2 represents a top sectional view upon the lines 2--2 of Fig; 3;

Fig. 3 represents a side sectional view upon the line 3-3 of Figs. 1 and 2; and

Fig. 4 represents a side view of the combined Fig. 5 is a sectional view upon lines 55 of Fig. 2.

The embodiment of the present invention shown upon the accompanying drawings is especially adapted to be utilized when it is not 6 desired to make any change in the form or construction of the ordinary household sink. The machine is especially economical in space utilization and is adapted to be positioned centrally under the ordinary household sink. It isalso so 55 designed and constructed that relatively few changes in the piping of the ordinary household sink are necessary in order to connect the feed and discharge lines of the sink to the dishwashing machine tank. The machine is hung'on the 7 wall at the top and also supported close'to the floor upon the motor body, as shown. The tank is caused to open at the side so as to permit the apparatus to be readily loaded and so as to eliminate the necessity of lifting the dishes any con- 'siderable distance.

In the drawings (see Figs. 1 and 4) the standard household sink 21 is shown provided with the sink portion 22, the drainboard 23, the overhanging apron 24 and the backboard 25. The sink is also provided with the hot and cold water inlets 26 and 27 and the mixer faucet 28. The bottom of the sink portion 22 is caused to drain centrally and the lowermost portion is provided with he drain pipe 29. The hot water inlet 26 and'the drain pipe of the sink 29 are connected into the dishwashing machine in a manner which will be subsequently described.

The dishwashing machine proper consists of a rectangular shaped tank 51, (see Figs. 1, 2, 3 and 4) which is provided with a sloping bottom 52, said sloping bottom having an outside portion 53; slightly inclined, and an interior portion 54 which is inclined at a much greater angle so as to cause the formation of a deeper pool of water in the central portion of the tank. The tank 51 forms the washing chamber of the machine and is supplied with the racks 55 and 56, which are adapted to support the dishes and other articles to be cleansed in proper relationship to the cleansing spray. The central portion of the sloping bottom blends into a rather short cylindrical chamber 5'7 (see Figs. 1 and 3) which is provided with a sloping bottom 58. Below the cylindrical chamber 57 is another cylindrical chamber 59 which contains the mechanism adapted to remove all liquid from the tank. The tank of the machine is partly supported upon the motor 65, which is in turn supported upon the standard 66, which rests directly uponv the floor. Between the motor casing and the standard 66 is positioned a rubber washer 67 which reduces the amount of noise and the vibration transmitted to the standard.

The motor 65 (see Fig. 3) drives the impeller or main water actuating or spraying device of the dishwashing machine. The shaft 300 of the motor extends upwardly in the washing chamber to a point substantially adjacent the top of the draining bottom 52, where it is attached to the top of the impelling device. The top of the shaft is usually so positioned as to be above the normal liquid level of the tank. It will be noted (see Figs. 1 and 3) that the lower inner portion of the blades of the impeller '75 are cut away so that the impeller may embrace a level and discharge mechanism. The motor shaft is surrounded by a vertical tubular bearing 301 which extends upwardly adjacent the top of the shaft. Surrounding this tubular bearing and attachedto the impeller 75 is a sleeve 302. This sleeve extends downwardly to the chamber 59 and has attached around the lower portion thereof centrifugal pump blades 303 which.ar curved opposite to the direction of rotation thereof. Chambers 57 and 59 are separated by a centrally perforated plate 304. Integral with the inner edge of this plate is a substantially vertical outer valve casing 305 having openings 306. Cooperating with this outer valve casing is a vertical inner valve casing 307 which has openings adapted to communicate with the openings in the outer casing when in draining position, and to rotate away from communication with the openings in the outer casing when in closed position. To the inner side of the inner casing 307 is attached anupwardly extending drain casing 308 which determines the level of liquid within the tank when the valve mechanism is in closed position. Operation of the rotatable inner valve casing is had by actuating rod 154 which is connected to arm 309. This arm is secured to casing 307 by a screw washer 310. Actuation of rod 15 in one direction causes the openings in the inner casing and in the outer casing to be in communication, thereby draining the entire amount of water from the washing tank. Actuation ofthe rod 154 in the opposite direction closes the valve and prevents the escape of water from the tank. When the valve is in closed position the drain casing 308 determines the liquid level within the tank. Surrounding the valve casings and drain casing 308 is an apron 311' which serves to retard waste materials from being picked up by the impeller '75. The driving connections and the drain-level'mechanism are more fully described and claimed in the copending application Serial No. 449,186, filed May 2, 1930. Within the chamber of the dishwashing machine may be placed racks for holding dishes, cups, glasses, spoons, knives, forks, pots, pans and other similar utensils (see Figs. 1, 2 and 3). There may be one rack or several, and if there are several, it is desirable that all the upper racks rest upon the lowermost rack. The lowermost rack is preferably provided on its lower surface with a carriage 110 which carriage is provided with a series of rollers 111. Supported on the bottom of the tank are the rods 112 which cooperate with the carriage 110 and the rollers 111 so as to permit the combined rack structure to be readily removed from the washing chamber of the tank. The front side of the tank is provided with a pivoted cover 113 which is adapted either to be placed in vertical position and close the tank or in horizontal position and permit access to the washing chamber. The lid 113 (see especially Figs. 2 and 3) is provided with inwardly extending side walls 114 which cooperate with corresponding turned-in portions 115 so as to form a moistureproof connection when the washing chamber is closed. The pockets 116 between the side walls of the tank and the turned-in portion 115 are made of such shape that they will be readily cleansed by the projected spray. The cover 113 is hinged at 120 to the lower portion of the tank adjacent the draining bottom thereof. By means of this hinge it is possible to swing the cover down in horizontal position, as indicated at Fig. 3. On the inside portion of the lid is a rod 117 which is adapted to cooperate with the rod 112 in the interior of the tank. The ends of these rods are adapted to cooperate with each other at 118 so as to form a smooth connection over which the carriage 110 may be readily rolled. That is, horizontal extensions on the end of rod 112 form a groove into which a central extension or tongue on rod 117 is rotatably received, as shown in Figs. 2 and 3. When the washing chamber of the tank has been opened and the lid put into horizontal position, it is possible to roll the combined rack structure out of the washing chamber onto the horizontally positioned cover structure 113, in which position the rack may be loaded or unloaded. It will be seen from Figs. 2 and 3 that the door or cover is provided with an extension on its bottom which extends within the tank, downwardly adjacent the bottom of the tank. This bottom extension conformsto the general contour of the tank and prevents water or spray from being thrown beneath it and out of the tank along the hinged portion of the cover. When the tank is in closed position, as shown in Fig. 2', the downwardly extending portion of the cover cooperates with the inwardly turned portion of the cover forming a water-tight connection therewith and increasing the strength of the door.

To enable hot water to be admitted to the washing chamber of the machine, a connection 125 to the main hot water inlet 26 of the sink (see Figs. 1, '2, 3 and 4) is made. The connection 125 extends downwardly in the rear of the backboard 25 until it reaches a point adjacent the top of the tank where it is provided with a forwardly extending horizontal connection 126 which in turn is provided with a horizontal connection 127 which extends into the upper part of the washing chamber of the tank. Between the connections 126 and 127 is positioned a valve 128, which is controlled by means of the rod 129 and the handle 130. The rod 129 is of such a length and the handle 130 is so positioned that it is readily accessible for manual operation. The rod 129 is supported in the block 131. Within the upper portion of the washing chamber of the tank are the spray heads 132 which face inwardly and downwardly and connect with the inlet pipe 127. These spray heads admit the incoming water to the washing machine in such a manner that it strikes upon the various articles within the washing chamber to be cleansed.

Hot water is usually admitted tothe washing chamber of the tank until it reaches the level of the overflow device, which overflow device is so constructed as to cause the tank to be filled with water to its normal operating level.

The level-drain mechanism is actuated in the following manner: The rod 154 passes through the packing nut 155 in the wall of the chamber 57 and connectswith a bell crank lever 156 (see Fig. 3) which is pivotally attached to a fixture 157 positioned on the bottom of the tank. The bell crank lever 156 is actuated through the vertical rod 158, which at its upper end is connected to another lever 159. The lever 159 is rotated by means of the rod 160. The rod 160 extends from the rear of the tank to the front of-the tank and 'is provided at the front of the tank with a handle 161} By means of the handle 161 it is possible to turnthe rod 160, elevate or depress the rod 158, reciprocate the rod 154 and open or close the'drain valve. The rod 160 is provided with bearings in the block 131 and the fixture 162 attached to the side of the tank toward the rear thereof.

When it is desired to charge the washing machine with either wash or rinse liquid, the drain valve is turned into closed position. The water is then permitted to flow into the chamber 57 and the lower part of the washing compartment until it reaches approximately the normal liquidlevel, whereupon it will overflow into the chamber 59.

During all the time the overflow 'is taking place, the centrifugal device in chamber 59 is discharging the excess water. This prevents an overcharging of the machine with wash or rinse liquid, and at the same time results in a motion of the water through the discharge lines, which is readily apparent to the operator, whereupon he may shut the inlet and prevent any further amount of water from flowing into the machine. In order to achieve this result, of course, it is desirable to have the driving shaft turning while the machine is being filled with water.

When it is desirable to discharge the machine, the handle 161 on the rod 160 is turned so as to open the drain valve, whereupon the water will flow out of the tank into the discharge or pump chamber 59.

The centrifugal pump in the chamber 59, discharges the waste liquids from the tank into the discharge line 201 (see Figs. 1, 2 and 4). Upon the discharge line 201 are positioned the draincock connection or emergency drain 202 and the check valve 203. The drain connection 202 enables complete draining of any water which may collect in either chamber 5'7 or 59, and the check valve 203 prevents a reverse flow of water in the discharge line 201., The discharge line 201 has an upwardly extending portion 222 which communicates' with the trap 220 attached to the bottom of the sink. The waste liquid from the dishwashing machine is discharged intothe discharge pipe of the sink at a point above the trap 220. The discharge line of the wishwasher is turned downwardly into the discharge line of the sink, as indicated at 209, 'so that the discharged liquids will flow down the drain pipe and so as to decrease the possibility of such liquids flowing into the sink.

Positioned within the block 131 between the bearing for the inlet valve rod 129 and the drain valve rod 160 is the switch 205. It will be noted that all the controls are placed together on the side of the tank toward the upper front corner thereof. This arrangement is very convenient, inasmuch as the person operating the machine may readily start or stop the motor, and may also readily control the inlet and drain connections. The plate 206 will be noted extending upwardly from the top of the dishwasher tank (see Figs.

3 and ,4). 'Thisplate' extends upwardly behind and to a point-above the lowest portion of the apron2 4f a -P0sitioned upon th e bottom of the tank and attached thereto, ar'el'the bafile's 215 which are turned outwardly opposite to the direction of rotation, so as to pre'vent swirling of the water as it drains or flows downwardly over the bottom of the washing chamber into' the upper cylindrical chamber, 57 or the lower cylindrical chamber 59.

These baffles are positioned so as to extend across the portion of, the sloping bottom 54 having the maximumslope. 1

. The operation of the device'is as followsz-To load the 'machine, the cover'=113 is placed in horizontal position. The rack combination is then rolled out on the cover and the dishes and other articles to be cleansed are placed in position. The loaded rack is then rolled back into position in the washing chamber and the cover 113 is closed. The handle 130 is then turned so as to admit liquid into the tank. Before the liquid is admitted to the tank, there is placed either in the infiuent liquid or in the washing chamber directly suitable amounts of detergents such as trisodium phosphate and soap. In the preferred method of operation, it is preferable to start the motor by the switch 205 before admitting the liquid and cause the motor to run while admitting the liquid. In this manner the starting torque, of the motor is reduced, and the centrifugal pump in the chamber 59 is actuated so as to discharge any overflow or excess cleansing or rinse liquid. When the tank has been filled to the normal level the excess water will overflow into the chamber 59 and discharge through the conduits 201, 222 and 209 into the trap 220 of the sink. When it is desired to drain the machine, the handle 161 is turned so as to open the drain valve and permit all liquid in the lower part of the tank to drain. into the pump or discharge chamber 59; The articles within the machine may be subjected to several cleansing and rinsing operations of this character. After the last rinsing operation, preferably with hot water, the front of the tank is opened and the loaded racks are rolled out upon the cover, and the cleansed and rinsed dishes and other articles are removed.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitation should be understood therefrom, but the appended claims should be construed as broadly as permissible in view of the prior art.

What is claimed is:

1. In a dishwashing machine, a tank forming a washing chamber, the front side of said tank being open, a door forming a closure for said open side and being hinged adjacent the lower edge of the opening in said front side, a first series of rails positioned in the lower part of the tank, a second series of cooperating rails upon the door operative to form a continuation of said first named rails when the door is lowered into horizontal position, said first series of rails and said second series of rails having tongue and groove connections, and a carriage structure mounted on said rails and operable to be moved from one of said series to the other.

2. In a washing machine, a tank having one side open from a point above the normal liquid level, the vertical portions of said tank framing said opening having turned-in portions extending a substantial depth into said tank, said turned-in portions being spaced from the sides of the tank,

. level, the vertical portions of said tank forming said opening having turned-in portions extending a substantial depth into said tank, said turned-in portions being spaced from the sides of the tank, a door pivotally mounted at its lower portion to the open side of said tank, vertical side portions on said door turned inwardly substantially parallel to the turned-in portions of said tank, the bottom of said door extending downwardlyinto said tank adjacent the bottom thereof, rails positioned in the lower part of the tank, and railson the inner side of said door cooperating with the rails within the tank when the cover is in open position to allow movement of a dish rack from the tank onto the cover, the downwardly extending portion of said door being p0- sitioned adjacent and beneath said rails when said door is in open position.

EDGAR s. STODDARD. 

